POWER INTERFACE CIRCUIT OF CONTACT IC CARD READER

摘要

A power interface circuit of a contact integrated circuit (IC) card reader is provided. The power interface circuit includes a power control unit configured to invert, amplify and output a power control signal supplied from the outside, a switching diode unit configured to control on and off operations of a ground terminal transistor in a complementary transistor unit in response to an output signal of the power control unit, the complementary transistor unit in which complementary transistors transfer a power supply terminal voltage to a power output unit or mute a card power supply terminal of the power output unit to a ground voltage level while operating inversely to each other in response to a control signal directly input from the power control unit and a control signal input through the switching diode unit, and the power output unit configured to output a voltage input through the complementary transistor unit to a card power supply terminal of an IC card or maintain the card power supply terminal at the ground voltage level in response to operation of the complementary transistor unit.